feat: Externalize script loading logic to improve code modularity and reusability

- Moved the logic for loading window variables from the server into a new utility function `loadWindowVariables.js`.
- Updated `Header` and `Dashboard` components to use the new utility function for fetching and setting window variables.
- Improved code readability and maintainability by centralizing the script loading process.

utils/loadWindowVariables.js

@@ -0,0 +1,81 @@
+// utils/loadWindowVariables.js
+
+export async function loadWindowVariables(apiUrl) {
+  return new Promise((resolve, reject) => {
+    // Funktion zum Laden eines Skripts und Setzen der `window`-Variablen
+    const loadScript = (src) => {
+      return new Promise((resolve, reject) => {
+        const script = document.createElement("script");
+        script.src = `${apiUrl}/CPL?${src}`;
+        script.async = true;
+        script.onload = () => {
+          resolve();
+        };
+        script.onerror = (error) => {
+          reject(error);
+        };
+        document.head.appendChild(script);
+      });
+    };
+
+    // Lade das Skript, das alle Variablen enthält
+    loadScript("last20Messages.acp")
+      .then(() => {
+        // Prüfen, ob alle Variablen verfügbar sind und sie in die Konsole ausgeben
+        if (window.last20Messages) {
+          console.log("Systemvariablen geladen:", {
+            // last20Messages.acp
+            last20Messages: window.last20Messages,
+            // System.acp Variablen
+            deviceName: window.deviceName,
+            mac1: window.mac1,
+            mac2: window.mac2,
+            ip: window.ip,
+            subnet: window.subnet,
+            gateway: window.gateway,
+            datetime: window.datetime,
+            // de.acp Variablen
+            de: window.de,
+            counter: window.counter,
+            flutter: window.flutter,
+            // kueConfig.acp Variablen
+            kueOnline: window.kueOnline,
+            kueID: window.kueID,
+            kueIso: window.kueIso,
+            // kuedetail.acp Variablen
+            kueValid: window.kueValid,
+            kueAlarm1: window.kueAlarm1,
+            kueAlarm2: window.kueAlarm2,
+            kueRes: window.kueRes,
+            kueCableBreak: window.kueCableBreak,
+            kueGroundFault: window.kueGroundFault,
+            kueLimit1: window.kueLimit1,
+            kueLimit2Low: window.kueLimit2Low,
+            kueLimit2High: window.kueLimit2High,
+            kueDelay1: window.kueDelay1,
+            kueLoopInterval: window.kueLoopInterval,
+            kueVersion: window.kueVersion,
+            tdrAtten: window.tdrAtten,
+            tdrPulse: window.tdrPulse,
+            tdrSpeed: window.tdrSpeed,
+            tdrAmp: window.tdrAmp,
+            tdrTrigger: window.tdrTrigger,
+            tdrLocation: window.tdrLocation,
+            tdrActive: window.tdrActive,
+            kueOverflow: window.kueOverflow,
+            kue100V: window.kue100V,
+            kueResidence: window.kueResidence,
+            tdrLastMeasurement: window.tdrLastMeasurement,
+            kueBooting: window.kueBooting,
+          });
+
+          resolve();
+        } else {
+          reject(new Error("Konnte last20Messages nicht finden."));
+        }
+      })
+      .catch((error) => {
+        reject(error);
+      });
+  });
+}